Code P0420

This topic contains 2 replies, has 3 voices, and was last updated by  jlkwiththree 3 years, 4 months ago.

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    I’m getting a code of P0420 whichever says my bank one cat is having problems. Anyone else have this issue



    I read somewhere in this forum it can be caused by a finiky oxygen sensor. My 2006 gives me this code when I drive on a trip for more than 300 miles. I just reset the code and it stays off until the next long trip.



    Try this – it worked for me. With about a half tank of gas, put in a gallon of acrylic paint thinner. Then take it on a non-stop drive of about 100 miles. I did this a few months back on my way to Hilton Head and it took care of the code, made the engine run better, and I am now getting about 1 MPG more. Amazing.

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